.header {
  height: 70px;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #0077ff;
  font-size: 24px;
  font-weight: 700;
  color: #fff;
}

.content-box {
  width: 100%;
  height: calc(100vh - 70px);
  display: flex;
  .box-l {
    width: 300px;
    height: 100%;
    overflow-y: scroll;
    padding: 10px;
    box-sizing: border-box;
  }
  .box-c {
    width: 800px;
    height: 100%;
    padding: 20px;
    box-sizing: border-box;
    margin: 0px 15px;
    background-color: #f1f3f7;
  }
  .box-r {
    flex: 1;
    height: 100%;
    padding: 20px;
    box-sizing: border-box;
    border-left: 2px solid #e4e4e4;
  }
}
